Clef is a genre-savvy and eccentric individual, meaning that he will use his knowledge of a genre to draw conclusions about his situation. Clef is also a known liar of all things except SCP Foundation-related issues, with him saying his name is a major chord on a ukulele. Alto Clef is competent and professional at his job and what he does, but he has an acerbic attitude and the habit of annoying his coworkers. Clef also has a slimy personality, which basically acts as a "woman repellent."